ADVENTURE COMICS #97, 1945. Very dynamic S&K cover of Sandman and Sandy facing off against aliens.
HOUSE OF MYSTERY #79, 1958. The monster on this cover is kind of weak, but the foreground figure is nice, with some nice inking from that period.
DEFENDERS, THE #43, 1977. Al Milgrom inks, with a nice big Hulk figure. Kirby drawing Doc Strange always looks a bit wrong, though.